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Business Segment Information - Total Assets by Segment (Details) - USD ($) $ in Millions	Oct. 01, 2021	Jan. 01, 2021
Segment Reporting Information [Line Items]
Assets	$ 35,018	$ 36,960
Identifiable intangibles assets acquired	6,796	7,908
Operating segments | Integrated Mission Systems
Segment Reporting Information [Line Items]
Assets	9,157	8,906
Operating segments | Space and Airborne Systems
Segment Reporting Information [Line Items]
Assets	7,149	6,943
Operating segments | Communication Systems
Segment Reporting Information [Line Items]
Assets	5,990	5,746
Operating segments | Aviation Systems
Segment Reporting Information [Line Items]
Assets	3,712	5,026
Corporate
Segment Reporting Information [Line Items]
Assets	9,010	10,339
Corporate | Exelis
Segment Reporting Information [Line Items]
Identifiable intangibles assets acquired	$ 6,800	$ 7,900

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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